I just heard about webware on the mp3 insider podcast from cnet. Very cool site, with reviews and links to neat new web applications.
It was so funny that the first story was about Folia a social network site for gardeners. Funny because the first big Ruby on Rails website I built, lovemygarden.net was also a social networking site for gardeners.
I built it in 2006, when Rails was just getting really popular, and the advice that I found was to build a website about something that you're passionate about.
lovemygarden.net is still up there, but I found that doing a whole website just by myself was too big of a task. It's better to have a small team.